Pretty sure it's a Lantana, Ponty. People use them as bedding plants. I don't think it would survive a UK winter outdoors.

That was quick, Spritz! Thanks. I will look it up. I forgot to mention that it has woody stems, so I thought it might be a shrub. I have not planted it yet so I will find out more before taking the risk of planting it out.

I think it's a Lantana too, my guess is L.camara, sometimes called Ham & Eggs or Spanish Flag. I've seen them growing as a hedge in Malta, but they're not hardy enough to stay outdoors here. Call it a tender shrub?

Nice, though - the flowers change colour as they age, so you get different coloured flowers on the same plant. :-))

It is indeed Lantana. The berries after the flowers are very toxic so make sure you wash your hands after touching if they appear. All parts are considered toxic in fact though the berries more so. Still a lovely plant and as said must br brought indoors before frosts.

You see it in any Butterfly House as they just love it.

Thanks, everyone. We will now nurture it and ensure it Winters indoors.

Beattie is right saying they are trained to grow as hedges in Malta,and I confirm it is Lantana.One can see about 4 or 5 diff colours in San Anton
Gardens.

Yep, Lantana camara. It looks like the variety we know as 'Radiation', here in the States.

Thanks again, all. I looked at it this morning and find it difficult to believe, Spritz - there's a colour change already!
Thanks for the tip re. toxicity, Fractal. I'll have to keep it away from my inquisitive grand-sons!